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Instructions for adding extension elbows to the mufflers of affected aircraft in order that their exhaust outlets be at least nine inches from their respective center lines.
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Safety measure to prevent possible icing of the lower end of the crankcase breather tube.
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Inspect elevator cables for signs of fraying; replace pulleys with ones of larger radius.
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Modification to prevent the tailwheel from hitting the rudder.
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Changes for the purposes of flight safety enhancement regarding clevis pins in the flight control system.
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A loose exhaust manifold caused the Continental "50" to drop 125 revs. Tightening the manifold instantly recovered the lost power.
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Inspecting the the front fin attachment fitting for cracks around the weld at the fin end.
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Corrective measures to prevent failure of the exhaust system.
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Inspect for fatigue failure in the bulkhead to which the rear landing gear strut is bolted.
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Inspect the attachment of lower hinge and if cracks have developed in the spar or rib reinforce with .040 dural or steel channel as shown.